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Document and Entity Information Document
9 Months Ended
Sep. 30, 2011
Nov. 01, 2011
Document Information [Line Items]  
Entity Registrant NamePNM RESOURCES INC 
Entity Central Index Key0001108426 
Current Fiscal Year End Date--12-31 
Entity Filer CategoryLarge Accelerated Filer 
Document Type10-Q 
Document Period End DateSep. 30, 2011 
Document Fiscal Year Focus2011 
Document Fiscal Period FocusQ3 
Amendment Flagfalse 
Entity Common Stock, Shares Outstanding 86,673,174
Public Service Company of New Mexico [Member]
  
Document Information [Line Items]  
Entity Registrant NamePUBLIC SERVICE CO OF NEW MEXICO 
Entity Central Index Key0000081023 
Current Fiscal Year End Date--12-31 
Entity Filer CategoryNon-accelerated Filer 
Entity Common Stock, Shares Outstanding 39,117,799
Texas-New Mexico Power Company [Member]
  
Document Information [Line Items]  
Entity Registrant NameTEXAS NEW MEXICO POWER CO 
Entity Central Index Key0000022767 
Current Fiscal Year End Date--12-31 
Entity Filer CategoryNon-accelerated Filer 
Entity Common Stock, Shares Outstanding 6,358